| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * system.c - a driver for reserving pnp system resources |
| 3 | * |
| 4 | * Some code is based on pnpbios_core.c |
| 5 | * Copyright 2002 Adam Belay <ambx1@neo.rr.com> |
| 6 | * |
| 7 | */ |
| 8 | |
| 9 | #include <linux/pnp.h> |
| 10 | #include <linux/device.h> |
| 11 | #include <linux/init.h> |
| 12 | #include <linux/slab.h> |
| 13 | #include <linux/kernel.h> |
| 14 | #include <linux/ioport.h> |
| 15 | |
| 16 | static const struct pnp_device_id pnp_dev_table[] = { |
| 17 | /* General ID for reserving resources */ |
| 18 | { "PNP0c02", 0 }, |
| 19 | /* memory controller */ |
| 20 | { "PNP0c01", 0 }, |
| 21 | { "", 0 } |
| 22 | }; |
| 23 | |
| 24 | static void reserve_ioport_range(char *pnpid, int start, int end) |
| 25 | { |
| 26 | struct resource *res; |
| 27 | char *regionid; |
| 28 | |
| 29 | regionid = kmalloc(16, GFP_KERNEL); |
| 30 | if ( regionid == NULL ) |
| 31 | return; |
| 32 | snprintf(regionid, 16, "pnp %s", pnpid); |
| 33 | res = request_region(start,end-start+1,regionid); |
| 34 | if ( res == NULL ) |
| 35 | kfree( regionid ); |
| 36 | else |
| 37 | res->flags &= ~IORESOURCE_BUSY; |
| 38 | /* |
| 39 | * Failures at this point are usually harmless. pci quirks for |
| 40 | * example do reserve stuff they know about too, so we may well |
| 41 | * have double reservations. |
| 42 | */ |
| 43 | printk(KERN_INFO |
| 44 | "pnp: %s: ioport range 0x%x-0x%x %s reserved\n", |
| 45 | pnpid, start, end, |
| 46 | NULL != res ? "has been" : "could not be" |
| 47 | ); |
| 48 | |
| 49 | return; |
| 50 | } |
| 51 | |
| 52 | static void reserve_resources_of_dev( struct pnp_dev *dev ) |
| 53 | { |
| 54 | int i; |
| 55 | |
| 56 | for (i=0;i<PNP_MAX_PORT;i++) { |
| 57 | if (!pnp_port_valid(dev, i)) |
| 58 | /* end of resources */ |
| 59 | continue; |
| 60 | if (pnp_port_start(dev, i) == 0) |
| 61 | /* disabled */ |
| 62 | /* Do nothing */ |
| 63 | continue; |
| 64 | if (pnp_port_start(dev, i) < 0x100) |
| 65 | /* |
| 66 | * Below 0x100 is only standard PC hardware |
| 67 | * (pics, kbd, timer, dma, ...) |
| 68 | * We should not get resource conflicts there, |
| 69 | * and the kernel reserves these anyway |
| 70 | * (see arch/i386/kernel/setup.c). |
| 71 | * So, do nothing |
| 72 | */ |
| 73 | continue; |
| 74 | if (pnp_port_end(dev, i) < pnp_port_start(dev, i)) |
| 75 | /* invalid endpoint */ |
| 76 | /* Do nothing */ |
| 77 | continue; |
| 78 | reserve_ioport_range( |
| 79 | dev->dev.bus_id, |
| 80 | pnp_port_start(dev, i), |
| 81 | pnp_port_end(dev, i) |
| 82 | ); |
| 83 | } |
| 84 | |
| 85 | return; |
| 86 | } |
| 87 | |
| 88 | static int system_pnp_probe(struct pnp_dev * dev, const struct pnp_device_id *dev_id) |
| 89 | { |
| 90 | reserve_resources_of_dev(dev); |
| 91 | return 0; |
| 92 | } |
| 93 | |
| 94 | static struct pnp_driver system_pnp_driver = { |
| 95 | .name = "system", |
| 96 | .id_table = pnp_dev_table, |
| 97 | .flags = PNP_DRIVER_RES_DO_NOT_CHANGE, |
| 98 | .probe = system_pnp_probe, |
| 99 | .remove = NULL, |
| 100 | }; |
| 101 | |
| 102 | static int __init pnp_system_init(void) |
| 103 | { |
| 104 | return pnp_register_driver(&system_pnp_driver); |
| 105 | } |
| 106 | |
| 107 | /** |
| 108 | * Reserve motherboard resources after PCI claim BARs, |
| 109 | * but before PCI assign resources for uninitialized PCI devices |
| 110 | */ |
| 111 | fs_initcall(pnp_system_init); |